Hello all. Have a 75 gallon tank. Cycled and had cleanup crew. All was well. Had 2 small clowns less then 1 inch each and a royal gramma. Just over 4 weeks in a 20 gallon qt I set up with no issue. everyone eat. Everything was good. I did not treat for anything as I didn't see any issues with fish. Fish went into main and everything was good. The following week 3 corals were added. Corals look good. About a week after corals all 3 fish show signs of ich. They all have little white spots. So maybe the fish had ich in qt but never saw any signs of it. Or one of the corals had it on it and introduce it to my main. So need some help. My plan is to put all 3 fish back in qt. I plan on using copper. Leave the the main for 72-75 days fish less. I do have corals and cleanup crews. I assume they are fine and the ich will eventually die. I guess I won't be adding any corals in the future....